Preheat oven to 350 degrees Fahrenheit.

Pour half of the jar of vodka sauce into the bottom of a baking pan.

Add water to the remaining sauce in the jar, close the jar tightly, and shake well. Set aside.

In a large ziplock bag, add the cottage cheese, sour cream, egg, and one and a half cups of the shredded cheese. Seal the bag and shake and mix everything together well.

Cut off one corner of the bag. Use it like a piping bag to squeeze the filling into the uncooked jumbo shells.

Place the stuffed shells pasta-side down into the sauce in the baking pan.

Pour the remaining sauce and water mixture around and over the shells.

Cover the pan tightly with foil and bake for one hour.

Uncover and sprinkle the remaining half cup shredded cheese over the top.

Bake uncovered for another 10 minutes, until the cheese is melted and bubbly. Let sit a bit to set before serving.